How to keep the Domain Model free of persistence logic

Hello,

I have started a Blog on how to keep a Domain Model free of persistence logic (http://ricbrown.blogspot.com/2004/09/transparent-persistence-paradox.html).

I was wondering how NEO handles keeping persistence logic out of the Domain Model when the domain logic needs to search a large collection of elements (e.g., to check that a property is unique)?

Regards,
Richard